準実スケール人工雲実験施設を用いた硫酸アンモニウムエアロゾルが雲粒生成に与える影響の検討
山形, 定;三浦, 二郎;太田, 幸雄;藤吉, 康志
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http://hdl.handle.net/2115/55014
Abstract
The volume fraction (ε) of water soluble material in atmospheric aerosol particles is an important parameter related to their hygroscopicity and activation processes to form cloud and ice particles. To estimateεof coarse dust particles, confocal scanning laser microscope was applied to measure the volume difference of individual particles before and after water dialysis directly. Individual particles (sphere equivalent diameter approx. 1-8 μm) of Asian reference dusts (CJ1 and CJ2) and atmospheric coarse particles during four Asian dust events were analyzed to ascertainε. Median values ofεfor CJ1 and CJ2 were, respectively, 29% and 13% with no size trend. Median values ofεfor coarse aerosol particles during two dust events were 18-42%. Dust particles with high εare potentially important for acting as giant CCN. Therefore aging of dust particles during transport might enhance the number of giant CCN over the North Pacific.
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